The specific placement of a sword sheath, also known as wearing or carrying a sword, can vary depending on the culture, historical period, and the style of sword being worn. Here are a few common ways swords are worn:

1. Hip or Waist: Wearing a sword on the hip or waist is a common method in many cultures. The sheath is usually attached to a belt or sash and positioned on the dominant side of the wearer. The sword hangs vertically or diagonally from the belt, allowing for easy access and drawing.
2. Back or Spine: Some swords, particularly larger ones or those associated with specific warrior traditions, may be worn on the back or spine. The sheath is secured to a harness or baldric that is slung over one shoulder and diagonally across the chest and back. This method allows for a distinct look and potentially easier access to the sword from behind.
3. Shoulder or Crossbody: Certain historical periods and cultural practices involve wearing a sword across the shoulder or in a crossbody style. The sheath is attached to a baldric or strap that goes over one shoulder and diagonally across the chest to the opposite hip. This method distributes the weight of the sword and can provide a comfortable and secure fit.

It's important to note that the specific manner of wearing a sword sheath can also vary based on the purpose, rank, and traditions of the wearer. Different styles and materials of sheaths and their attachments may influence the positioning and method of carrying the sword.